Exxon Chemical Patents, Inc.

Andrew James Ritchie

Edward Francis Outten

Ricardo A Bloch

Malcolm Waddoups

Harold Shaub

Terence Colclough

Arunas T Lapinas

Ian Peter Field

A lubricating oil having an ashless nitrogenous TBN source together with ash containing detergent having a TBN in excess of 100, a source of magnesium, and metal dihydrocarbyl dithiophosphate with predominantly or exclusively secondary hydrocarbyl groups is described. It comprises a major amount of an oil of lubricating viscosity having a sulfated ash content between 0.35 and 2 mass percent and A) a nitrogenous TBN source selected from the group consisting of ashless nitrogen containing dispersants, ashless nitrogen containing dispersant viscosity modifiers, oil soluble aliphatic, oxyalkyl, or arylalkyl amines and mixtures thereof; B) a metal salt of an oil soluble acid having a TBN in excess of 100; C) at least 500 ppm (mass) magnesium; and D) at least one metal dihydrocarbyl dithiophosphate. The nitrogenous TBN source provides at least about 1.5 TBN to the finished lubricant. The metal salt of an oil soluble acid provides at least about 40% of the total TBN of the composition. At least 50 mole per cent of the hydrocarbyl groups on the dithiophosphate are secondary. Overbased magnesium sulfonate may be used as the metal salt of an oil soluble sulfonic acid having a TBN in excess of 100 and the additive providing at least 500 ppm (mass) magnesium. The lubricant may be free of aromatic amines having at least two aromatic groups attached directly to the nitrogen. It may have at least 100 ppm (mass) boron and at least 1000 ppm (mass) phosphorous. The boron-to-nitrogen ratio is at least 0.1.

Crankcase lubricant for modern heavy duty diesel and gasoline fueled

Crankcase lubricant compositions for use in automobile or truck engines comprise a major amount of a lubricating oil, added copper present in oil-soluble form, at least 2 ppm of molybdenum present in oil-soluble form, and a total of from 0.05 to 2 mass % of one or more oil-soluble aromatic amines. The specified additives provide a highly effective antioxidant system.

Lubricating compositions with improved antioxidancy comprising added

Thus, the instant invention is directed toward an oil for diesel engines comprising an admixture of (A) a major amount of an oil of lubricating viscosity, (B) at least 4 mass % dispersant, (C) at least 0.3 mass % of a metal phenate, (D) less than 0.1 mass % friction modifier, (E) less than 0.3 mass % of sulfurized phenols and, (F) less than 0.12 mass % neutral calcium sulfonate.

Crankcase lubricant for heavy duty diesel oil

Substituted para-phenylene diamines have been found to be effective antioxidants capable of protecting crankcase lubricating oils from thickening and sludge formation after prolonged exposure to oxygen at elevated temperature.

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Chatham, NJ, United States of America

Andrew James Ritchie